IfcBlender is an addon for Blender to import IFC files (wikipedia). IFC is an open exchange format for building and construction data, that contains both geometry and semantic and topological information.

IfcBlender is based on IfcOpenShell, the free open source IFC implementation written in C++.

Installation instructions:

Download the appropriate IfcBlender archive for your system

Install the Blender add-on by clicking on File > User Preferences > Add-ons > Install from File... and by pointing Blender to the archive downloaded above